FWIW, about 2 years ago I was driving Quad 988 (86dB) with the Pass 2.5/150 (I assume you meant 2.5 not 2.3) combo and was quite pleased. The 988 impedance drops to 2 ohms around 10Khz if I'm not mistaken and the 150 didn't miss a beat. I believe your speakers are 90dB with a 6 ohm impedance. You should have plenty of power for your SFGP. Pass sounds more musical and engaging than Bryston, Krell, and Classe' IMO but to each his own.
Good luck.
Good luck.